“Technical question on Notaio

“Technical"  question on Notaio function What is the responsibility of a Notaio to ascertain the “validity” of the method of payment at the closing of a real estate sale in Italy? In forty plus years of real estate dealing, buying and selling in Europe and obviously in the lower price brackets, have always had all cash transactions. Does the Notaio have to verify the validity of the payment method?If the seller accepts a check, personal, bank draft, certified, whatever, does the Notaio have any responsibility to determine the validity of such payment or is the seller’s willingness to accept such payment satisfactory, provided, however the stated price/value is legitimate.Or accepting stock certificates, bitcoins, other property in exchange, or a partridge in a pear tree?Every transaction we have had, the Notaio always left the room or turned his back when the payment was handed over so how would he know what the payment actually consisted of. Anyone have any wisdom on this?Thanks,Fred